Radiation effects in electroweak processes at current and future hadron colliders
Final Report Abstract
After the discovery of the Higgs boson accurate measurements confronted with highprecision calculations are essential to reveal whether all properties of this new particle are compatible with the expectations of the Standard Model. Accurate predictions and flexible tools for Higgs production processes at the LHC are a crucial prerequisite for achieving that goal. While the status of the required higher-order perturbative calculations in terms of the strong interaction is quite advanced, electroweak corrections have received less attention in the past. However, their impact can be considerable at currently accessible collider energies already, and is expected to become even more significant at future hadron colliders operating at yet higher energies. With this DFG funded project we contributed to closing that gap for the phenomenologically particularly important process of electroweak H+2 jets production at hadron colliders. We developed an implementation of the electroweak production process of the H+2 jets final state in hadron-hadron collisions including NLO-QCD and NLO-EW corrections and their matching to QCD and QED showers within the POWHEG-BOX framework. Our code constitutes the first dedicated public implementation of this process including both HV and VBF topologies as well as their interference at NLO-EW+PS level. At NLO-QCD+PS precision our results are consistent with previous calculations for the individual HV and VBF contributions. The size of the fixed-order QCD and electroweak corrections is found to be moderate, but dependent on the considered selection cuts. QCD shower effects slightly modify the NLO-QCD predictions and are most pronounced for distributions of non-tagging jets. The impact of QED shower effects is small. A detailed comparison of various Monte-Carlo tools for the simulation of VBF-induced H+2 jets production emphasized the importance of suitable settings in the employed parton-shower generator. In particular, when PYTHIA8 is used the dipole shower should be used for the simulation of VBF processes. The versatility of our new code paves the way for comprehensive studies of parton-shower generators and their optimal settings for H+2 jets production in more general setups.
Publications
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Parton-shower effects in Higgs production via vector-boson fusion. The European Physical Journal C, 80(8).
Jäger, Barbara; Karlberg, Alexander; Plätzer, Simon; Scheller, Johannes & Zaro, Marco
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Electroweak corrections and shower effects to Higgs production in association with two jets at the LHC. Journal of High Energy Physics, 2022(9).
Jäger, Barbara & Scheller, Johannes
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NLO Corrections and Parton Shower Effects on Electroweak Higgs Production in Association with Two Jets, PhD thesis, University of Tübingen (defended 2023)
J. Scheller
